What are some other ways to describe disks sparkling with electricity? I think the description says "disks course with electricity," but I am not sure course has the meaning of "circled by running electricity." So I am not sure if I heard the description right. My understanding is "course" as a verb means run through. But I have never heard "course with electricity".
The phrase "blood courses through my veins" - meaning blood runs/flows through my veins, is the immediate thing that comes to my mind with course - and perhaps the writer was comparing electricity to blood flow of a living person.
Of course the clearer way to say it and more obviously draw that parallel would be to say "electricity courses through the disks."
Some words to describe what electricity does would be crawl, writhe, pulsate, wave, trace, lick, etc. There isn't a common word that directly describes the movement of electrical arcs, unfortunately.